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BUG: KASAN: use-after-free in __ethtool_get_link_ksettings+0x1bf/0x200 net/ethtool/ioctl.c:442
Read of size 8 at addr ffff88802091e2e8 by task kworker/0:1/9

CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.13.0-rc3-syzkaller-00026-g59dbb9d81adf #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events smc_ib_port_event_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:489
 kasan_report+0xd9/0x110 mm/kasan/report.c:602
 __ethtool_get_link_ksettings+0x1bf/0x200 net/ethtool/ioctl.c:442
 __ethtool_get_link_ksettings+0x145/0x200 net/ethtool/ioctl.c:449
 ib_get_eth_speed+0x123/0xb50 drivers/infiniband/core/verbs.c:1996
 rxe_query_port+0x72/0x200 drivers/infiniband/sw/rxe/rxe_verbs.c:55
 __ib_query_port drivers/infiniband/core/device.c:2112 [inline]
 ib_query_port drivers/infiniband/core/device.c:2144 [inline]
 ib_query_port+0x43e/0x8a0 drivers/infiniband/core/device.c:2134
 smc_ib_remember_port_attr net/smc/smc_ib.c:364 [inline]
 smc_ib_port_event_work+0x130/0xc00 net/smc/smc_ib.c:388
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2091e
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 ffffea0000824788 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5933, tgid 5933 (syz-executor), ts 46244344597, free_ts 72405414107
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556
 prep_new_page mm/page_alloc.c:1564 [inline]
 get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474
 __alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4751
 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269
 alloc_slab_page mm/slub.c:2423 [inline]
 allocate_slab mm/slub.c:2589 [inline]
 new_slab+0x2c9/0x410 mm/slub.c:2642
 ___slab_alloc+0xd7d/0x17a0 mm/slub.c:3830
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920
 __slab_alloc_node mm/slub.c:3995 [inline]
 slab_alloc_node mm/slub.c:4156 [inline]
 __kmalloc_cache_noprof+0xfa/0x410 mm/slub.c:4324
 kmalloc_noprof include/linux/slab.h:901 [inline]
 kzalloc_noprof include/linux/slab.h:1037 [inline]
 snmp6_alloc_dev net/ipv6/addrconf.c:359 [inline]
 ipv6_add_dev+0x5ed/0x13f0 net/ipv6/addrconf.c:409
 addrconf_notify+0x53e/0x19c0 net/ipv6/addrconf.c:3674
 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996
 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline]
 call_netdevice_notifiers net/core/dev.c:2048 [inline]
 register_netdevice+0x17a0/0x1e90 net/core/dev.c:10632
 virt_wifi_newlink+0x3ed/0x980 drivers/net/wireless/virtual/virt_wifi.c:567
 rtnl_newlink_create net/core/rtnetlink.c:3786 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3896 [inline]
 rtnl_newlink+0xb95/0x1d60 net/core/rtnetlink.c:4011
 rtnetlink_rcv_msg+0x95b/0xea0 net/core/rtnetlink.c:6921
page last free pid 6791 tgid 6789 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_unref_page+0x661/0x1080 mm/page_alloc.c:2657
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4119 [inline]
 slab_alloc_node mm/slub.c:4168 [inline]
 kmem_cache_alloc_node_noprof+0x223/0x3c0 mm/slub.c:4220
 __alloc_skb+0x2b1/0x380 net/core/skbuff.c:668
 alloc_skb include/linux/skbuff.h:1323 [inline]
 nlmsg_new include/net/netlink.h:1018 [inline]
 rtmsg_ifa+0x16a/0x2a0 net/ipv4/devinet.c:1967
 __inet_del_ifa+0x3c9/0xf40 net/ipv4/devinet.c:458
 inet_del_ifa net/ipv4/devinet.c:496 [inline]
 inetdev_destroy net/ipv4/devinet.c:336 [inline]
 inetdev_event+0x595/0x18a0 net/ipv4/devinet.c:1663
 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996
 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline]
 call_netdevice_notifiers net/core/dev.c:2048 [inline]
 unregister_netdevice_many_notify+0x8d5/0x1e60 net/core/dev.c:11526
 rtnl_delete_link net/core/rtnetlink.c:3476 [inline]
 rtnl_dellink+0x3d7/0xaa0 net/core/rtnetlink.c:3518
 rtnetlink_rcv_msg+0x95b/0xea0 net/core/rtnetlink.c:6921
 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2542
 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]
 netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1347

Memory state around the buggy address:
 ffff88802091e180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802091e200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88802091e280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                          ^
 ffff88802091e300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802091e380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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